The most frequently installed top-opening roller system in the world!

All systems shown here hold Euro patents 0982466 and 1388637

VariVent® TF Pull wire

Thanks to the specific compensating mechanism of the GKT telescopic coupling, no tension is required on the sheeting and no readjustment is possible.

With a single drive unit, the upper edge is lowered and is bottom-rolled synchronously. This eliminates any possibility of collision and makes the system simple to install.

VariVent® TF Central tube

Top-opening roller system with central tube. Less friction because no corner roller. Also, it is possible to override the main doors.

With a single drive unit, the upper edge can be lowered and synchronously rolled up at the bottom. Zero risk of collision.

Wickelsystem mit Zentralrohr für weniger Reibung und niedrigere Kollisionsgefahr. Das oben-öffnende Wickelsystem mit Zentralrohr verhindert Kollisionen durch synchrones absenken des oberen Randes und aufwickeln von unten. Das Wickelsystem mit Zentralrohr ermöglicht außerdem die Überbrückung von Toren.

VariVent® TF Diabolo

Top-opening roller system with a unique roller principle for confined installation spaces and cost savings.

Torque is introduced through contra-rotating cable drums. Proven compensating mechanism with telescopic coupling.